CVE-2026-56002: CWE-122 Heap-based buffer overflow in X.Org libXfont2
CVE-2026-56002 is a heap-based buffer overflow vulnerability in the pcfReadFont() function of libXfont2 before version 2.0.8. The vulnerability arises from missing glyph bounds checking, which may allow authenticated X clients to execute code within the X server. It has a high severity with a CVSS score of 8.5, indicating a significant risk of code execution and system compromise. A patch is available to address this issue.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-56002) affects libXfont2 versions prior to 2.0.8. The flaw is a heap-based buffer overflow in the pcfReadFont() function caused by missing glyph bounds checking. Exploitation requires an authenticated X client and could lead to arbitrary code execution within the X server process. The CVSS 3.1 base score is 8.5, reflecting high impact on confidentiality, integrity, and availability. No known exploits are reported in the wild. A patch is available to fix the issue.
Potential Impact
Successful exploitation can lead to arbitrary code execution within the X server, potentially compromising system confidentiality, integrity, and availability. The vulnerability requires local authenticated access by an X client, limiting remote exploitation without credentials. The high CVSS score (8.5) reflects the critical nature of the impact if exploited.
Mitigation Recommendations
A patch is available for libXfont2 version 2.0.8 that addresses this vulnerability. Users and administrators should upgrade to version 2.0.8 or later to remediate this issue. No additional mitigation steps are indicated.
CVE-2026-56002: CWE-122 Heap-based buffer overflow in X.Org libXfont2
Description
CVE-2026-56002 is a heap-based buffer overflow vulnerability in the pcfReadFont() function of libXfont2 before version 2.0.8. The vulnerability arises from missing glyph bounds checking, which may allow authenticated X clients to execute code within the X server. It has a high severity with a CVSS score of 8.5, indicating a significant risk of code execution and system compromise. A patch is available to address this issue.
CVSS v3.1
Score 8.5high
Affected software
pkg:github/freedesktop/xorg/libxfontRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-56002) affects libXfont2 versions prior to 2.0.8. The flaw is a heap-based buffer overflow in the pcfReadFont() function caused by missing glyph bounds checking. Exploitation requires an authenticated X client and could lead to arbitrary code execution within the X server process. The CVSS 3.1 base score is 8.5, reflecting high impact on confidentiality, integrity, and availability. No known exploits are reported in the wild. A patch is available to fix the issue.
Potential Impact
Successful exploitation can lead to arbitrary code execution within the X server, potentially compromising system confidentiality, integrity, and availability. The vulnerability requires local authenticated access by an X client, limiting remote exploitation without credentials. The high CVSS score (8.5) reflects the critical nature of the impact if exploited.
Mitigation Recommendations
A patch is available for libXfont2 version 2.0.8 that addresses this vulnerability. Users and administrators should upgrade to version 2.0.8 or later to remediate this issue. No additional mitigation steps are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- suse
- Date Reserved
- 2026-06-18T09:26:55.988Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a4e2371c9d9e3dbe3e2eb06
Added to database: 07/08/2026, 10:16:17 UTC
Last enriched: 08/07/2026, 05:55:39 UTC
Last updated: 08/22/2026, 10:52:10 UTC
Views: 111
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